How to download a planet minecraft game to xbox?

If the map is made for the PC version then you can't port it to the xbox, but if it's made for the 360 it can. I have no knowledge of the Xbox one so I'll assume you are talking about the 360. If you have a usb drive around the house, plug it in the xbox, and when the xbox asks to format it say yes. Then plug it in to your PC, put the map on the usb drive and then plug it back in the xbox. When you press play and it asks for the hard drive to use, select the usb drive and it should be there.